CN109119026A - A kind of pixel circuit data method for compensating signal, device and display panel - Google Patents
A kind of pixel circuit data method for compensating signal, device and display panel Download PDFInfo
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- CN109119026A CN109119026A CN201811145796.4A CN201811145796A CN109119026A CN 109119026 A CN109119026 A CN 109119026A CN 201811145796 A CN201811145796 A CN 201811145796A CN 109119026 A CN109119026 A CN 109119026A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Abstract
The invention discloses a kind of pixel circuit data method for compensating signal, it include: by real-time testing signal input data signal wire, detect real-time voltage of the first node Jing Guo the first preset time, by the real-time voltage compared with the predeterminated voltage of storage, if there are deviations for the real-time voltage and the predeterminated voltage, the initial compensation value of adjustment driving transistor mobility is so that the real-time voltage is consistent with the predeterminated voltage, wherein, the predeterminated voltage measures by the following method: obtaining the initial threshold voltage of driving transistor；It forms compensating test signal and input data signal wire obtains the initial compensation value of mobility；Form real-time testing signal and input data signal wire, the first voltage of the first node Jing Guo the first preset time is sensed as the predeterminated voltage, the present invention can detecting real-time driving transistor threshold voltage, with the threshold voltage and mobility real-time compensation to driving transistor, the luminous uniformity of display panel is improved.
Description
Technical field
The present invention relates to field of display technology.More particularly, to a kind of pixel circuit data method for compensating signal, device
And display panel.
Background technique
AMOLED (active matrix organic light-emitting diode) technology is the development trend of Mobile product, AMOLED display dress
It sets with self-luminous, driving voltage is low, luminous efficiency is high, the response time is short, clarity and contrast are high, nearly 180 degree visual angle, makes
It is wide with temperature range, it can be achieved that Flexible Displays and many advantages, such as large area total colouring.AMOLED is current driving apparatus, is shown
Each pixel includes driving transistor (TFT) to control the driving current flowed into OLED and then control in showing device
The light emission luminance of OLED.But since the process conditions of driving TFT are drawn with factors, equalized data signals such as drive environment differences
The driving current of the input AMOLED risen is not identical, so as to cause occurring luminance deviation between different pixels, usually adopts at present
With the characterisitic parameter of driving TFT in each pixel of sensing and it is corrected to reduce luminance deviation.However, existing compensation method
The characterisitic parameter of the driving TFT usually sensed under display device off-mode, when display device is normally shown, driving
The characterisitic parameter of TFT can change in OLED luminescence process, so that the driving current obtained after compensation changes,
It still will lead to and occur luminance deviation between different pixels.
Summary of the invention
It is an object of the present invention to provide a kind of pixel circuit data method for compensating signal, real-time detection drives TFT
Threshold voltage, and according to real-time threshold voltage to driving TFT mobility compensate, reduce display device show process
In each pixel between luminance deviation.It is another object of the present invention to provide a kind of pixel circuit data signal compensation dresses
It sets.Another purpose of the invention is that providing a kind of display panel.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
One aspect of the present invention discloses a kind of pixel circuit data method for compensating signal, and the pixel circuit includes that switch is single
Member, driving transistor, storage unit, luminescence unit and reset detection unit, wherein the switch unit and scan signal line,
Data signal line and driving transistor be separately connected, in response to scan signal line scanning signal and data signal line and drive is connected
Dynamic transistor；The control terminal of the driving transistor is connect with the switch unit, and first end is connect with the first voltage end,
Second end is connect with first node, in response to data signal line data-signal and generate driving current；The storage unit point
It is not connect with the control terminal of driving transistor and first node, the luminescence unit connects with first node and real-time voltage end respectively
It connects；The reset detection unit includes reset transistor and first capacitor device, and the control terminal of the reset transistor and reset are controlled
Line connection processed, first end are connect with first node, and second end is connect with the first end of first capacitor device and sensing signal line, and first
The second end of capacitor is grounded,
The compensation data signal method includes:
By real-time testing signal input data signal wire, real-time electricity of the first node Jing Guo the first preset time is detected
Pressure, if there are deviations for the real-time voltage and the predeterminated voltage, is adjusted by the real-time voltage compared with the predeterminated voltage of storage
The initial compensation value of whole driving transistor mobility so that the real-time voltage is consistent with the predeterminated voltage,
Wherein, the predeterminated voltage measures by the following method:
The initial threshold voltage of driving transistor is obtained to data signal line write-in threshold testing signal；
Compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains the initial of mobility
Offset；
Real-time testing signal and input data signal wire are formed according to the initial threshold voltage and the initial compensation value,
The first voltage of the first node Jing Guo the first preset time is sensed as the predeterminated voltage by the sensing signal line.
Preferably, it is specifically wrapped to the initial threshold voltage that data signal line write-in threshold testing signal obtains driving transistor
It includes:
Threshold testing signal is inputted to the data signal line；
Blanking voltage of the first node in the driving transistor cutoff is sensed by the sensing signal line；
The initial threshold voltage of driving transistor is obtained according to the threshold testing signal and the blanking voltage.
Preferably, the initial threshold voltage V of the driving transistorthFor
Vth=VG-VS1
Wherein, VGFor the voltage value of the threshold testing signal, VS1For the voltage value of the blanking voltage.
Preferably, compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains mobility
Initial compensation value specifically include:
Determine the compensating test signal Vdata1For
Vdata1=GL+Vth
Wherein, GL is fixed value, VthFor the initial threshold voltage for driving transistor；
The driving current i of driving transistor generation is when the compensating test signal inputs
I=μ (Vdata1-Vth)2=μ (GL+Vth-Vth)2=μ (GL)2
Wherein, μ is the initial migration rate for driving transistor；
Detection is obtained by time interval T2The second voltage of first node obtains the mobility of driving transistor, according to
Preset standard mobility obtains the initial compensation value K of mobility
I=U2/T2
Wherein, μ0For standard mobility, U2For second voltage.
Preferably,
The real-time testing signal Vdata2For
Vdata2=α K+Vth
Wherein, K is the initial compensation value for driving transistor, and α is definite value, VthFor the initial threshold voltage for driving transistor；
The driving current of the driving transistor is when real-time testing signal input
I '=μ (Vdata2-Vth)2=μ (α K+Vth-Vth)2=μ (α K)2
The first voltage is
VS1=T1I '=T1μ(αK)2
Then predeterminated voltage Tag1For
Tag1=VS1=T1μ(αK)2
Wherein, T1For the first preset time.
Preferably, the adjustment data-signal is so that the real-time voltage is consistent with the predeterminated voltage specifically wraps
It includes:
When the real-time voltage be greater than the predeterminated voltage, reduce the initial compensation value of mobility；
When the real-time voltage be less than the predeterminated voltage, increase the initial compensation value of mobility；
Above step is repeated until the real-time voltage is equal to the predeterminated voltage.
Preferably, the adjustment data-signal is so that the real-time voltage is consistent with the predeterminated voltage specifically wraps
It includes:
Obtain the VthDrift value Δ VthFor
Δ Tag=Tag2-Tag1
Wherein, α is definite value, and K is the initial compensation value of mobility, Tag2For real-time voltage, Tag1For predeterminated voltage；
According to the drift value Δ VthThe real time threshold voltage of driving transistor is obtained, and real time threshold voltage is replaced and is mended
Input data signal wire obtains the real-time compensation value of mobility after repaying the initial threshold voltage in test signal.
Preferably, when the pixel circuit is display state, the digital signal line nil signal input or described
The digital signal of digital signal line input is low level.
Another aspect of the present invention discloses a kind of pixel circuit data signal compensation apparatus, and the pixel circuit includes switch
Unit, driving transistor, storage unit, luminescence unit and reset detection unit, wherein the switch unit and scanning signal
Line, data signal line and driving transistor be separately connected, in response to scan signal line scanning signal and data signal line is connected
With driving transistor；The control terminal of the driving transistor is connect with the switch unit, first end and the first voltage end
Connection, second end connect with first node, in response to data signal line data-signal and generate driving current；The storage is single
Member respectively with driving transistor control terminal and first node connect, the luminescence unit respectively with first node and real-time voltage
End connection；The reset detection unit includes reset transistor and first capacitor device, the control terminal of the reset transistor and multiple
Position control line connection, first end are connect with first node, and second end is connect with the first end of first capacitor device and sensing signal line,
The second end of first capacitor device is grounded,
Described device includes the compensating unit being separately connected with the data signal line and the sensing signal line and correction
Unit；
The correction unit is used to real-time testing signal input data signal wire detecting the first node by first
The real-time voltage of preset time, by the real-time voltage compared with the predeterminated voltage of storage, if the real-time voltage with it is described pre-
If there are deviations for voltage, the initial compensation value of adjustment driving transistor mobility is so that the real-time voltage and the predeterminated voltage
Unanimously, wherein the predeterminated voltage is to obtain the initial of driving transistor by the way that threshold testing signal is written to data signal line
Threshold voltage；Compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains the initial of mobility
Offset；Real-time testing signal and input data signal wire are formed according to the initial threshold voltage and the initial compensation value,
It is obtained by the first voltage that the sensing signal line senses the first node Jing Guo the first preset time as predeterminated voltage.
Further aspect of the present invention discloses a kind of display panel, including pixel circuit as described above and pixel circuit data
Signal compensation apparatus.
Beneficial effects of the present invention are as follows:
The present invention, by real-time testing signal input data signal wire, detects the first node warp when pixel circuit is shown
The real-time voltage for crossing the first preset time, by the real-time voltage compared with the predeterminated voltage of storage, if the real-time voltage with
The predeterminated voltage indicates that the threshold voltage of driving TFT and mobility drift about there are deviation, needs again to driving TFT
Carry out mobility compensation, the present invention real-time detection can drive the threshold voltage of TFT when pixel circuit be in light emitting phase, and right
The mobility real-time compensation of TFT is driven, luminance deviation when reducing display panel display between different pixels.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows the schematic diagram of one specific embodiment of pixel circuit in the prior art of the invention.
Fig. 2 shows the flow diagrams of present invention pixel circuit data one specific embodiment of method for compensating signal.
Fig. 3 shows the process of present invention pixel circuit data one specific embodiment predeterminated voltage of method for compensating signal measurement
Schematic diagram.
Fig. 4, which is shown, obtains driving transistor in one specific embodiment of present invention pixel circuit data method for compensating signal
The flow chart of initial threshold voltage.
The charging that Fig. 5 shows first capacitor in one specific embodiment of present invention pixel circuit data method for compensating signal is shown
It is intended to.
Fig. 6 shows driving transistor controls end in one specific embodiment of present invention pixel circuit data method for compensating signal
The voltage of the one end connecting with first node changes with time schematic diagram.
Fig. 7 shows the schematic diagram of present invention pixel circuit data one specific embodiment of signal compensation apparatus.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
It can refer to Fig. 1, include switching transistor (TFT) and driving in the pixel circuit of existing AMOLED display device
TFT.Wherein, switch TFT is connect with data signal line, scan signal line and driving TFT, driving TFT and Input voltage terminal, switch
TFT and light-emitting component are separately connected.Switch TFT is in response to the scanning signal conducting data signal line of scan signal line and driving
TFT, driving TFT are connected in response to the data-signal of data signal line, generate driving current and input light-emitting component, light-emitting component
It shines under the driving current effect of input, to realize display function.
Drive the parameter characteristic of TFT since process conditions and drive environment may be different, different pixels are in phase
The driving current that same data-signal generates when inputting may be different, and then lead to the display brightness deviation between different pixels.
For this problem, due to driving TFT generate driving current mainly with driving TFT threshold voltage and mobility phase
It closes, current solution mostly uses greatly the threshold voltage of detection driving TFT during shutdown, and acquires drive according to the threshold voltage
The mobility of dynamic TFT further compensates driving TFT mobility, so that driving TFT in phase in each pixel in display device
It is consistent with the driving current generated when data-signal input, to reduce the luminance deviation between different pixels.But at present to migration
Usually detection obtains the threshold voltage of driving TFT and is compensated according to the threshold voltage in the power-offstate for the compensation of rate,
Display device drives the threshold voltage of TFT that can generate drift due to environmental factors such as temperature, to close when actual displayed works
Can be inaccurate to the compensation scheme of driving TFT mobility when machine state, luminance deviation is still remained between each pixel.
In view of this, according to an aspect of the present invention, present embodiment discloses a kind of pixel circuit data signal compensations
Method.Wherein, pixel circuit includes switch unit, driving transistor, storage unit, luminescence unit and reset detection unit.Picture
In plain circuit, switch unit is separately connected with scan signal line, data signal line and driving transistor；The driving transistor
Control terminal is connect with the switch unit, and first end is connect with the first voltage end, and second end is connect with first node P；Institute
State storage unit respectively with driving transistor control terminal and first node P connect, the luminescence unit respectively with first node P
It is connected with real-time voltage end, real-time voltage end can be ground terminal；Reset detection unit may include resetting TFT and first capacitor device
C1.Specifically, the control terminal for resetting TFT can be connect with control line is resetted, first end is connect with the first node P, second end
It is connect with the first end of first capacitor device C1, the second end ground connection of first capacitor device C1.First node P further with sensing signal
Line connection.Preferably, reset detection unit may also include the analog-digital converter connecting with sensing signal line, pass through analog-digital converter
The analog voltage of sensing signal line is converted into digital voltage to handle.
As shown in Fig. 2, the compensation method includes:
S100: by real-time testing signal input data signal wire, the first node P is detected by the first preset time
Real-time voltage.Specifically, inputting reseting controling signal to TFT is resetted by resetting control line, resets TFT and controlled in response to resetting
Signal conduction first node P and first capacitor device C1, so that first capacitor device C1 is started to charge, the voltage of first node P is increased.
S110: by the real-time voltage compared with the predeterminated voltage of storage, if the real-time voltage and the predeterminated voltage
There are deviations, and the initial compensation value of adjustment driving transistor mobility is so that the real-time voltage is consistent with the predeterminated voltage.
If the real-time voltage and the predeterminated voltage indicate that the initial threshold voltage of driving transistor and mobility may there are deviation
Changed, so as to cause the failure of static compensation scheme, needs to redefine the threshold voltage of driving transistor with true
Determine the offset of mobility, keeps brightness uniformity when display panel display.
In a preferred embodiment, if there are deviations for the real-time voltage and the predeterminated voltage, when the reality
When voltage be greater than the predeterminated voltage, reduce the initial compensation value of mobility；When the real-time voltage be less than the predeterminated voltage,
Increase the initial compensation value of mobility；Above step is repeated until the real-time voltage is equal to the predeterminated voltage.
It is preferably carried out in mode at another, data-signal can be adjusted so that institute according to real-time voltage and real-time compensation value
State that real-time voltage is consistent with the predeterminated voltage to be specifically included:
Obtain the VthDrift value Δ VthFor
Δ Tag=Tag2-Tag1
Wherein, α is definite value, and K is the initial compensation value of mobility, Tag2For real-time voltage, Tag1For predeterminated voltage；
According to the drift value Δ VthObtain the real time threshold voltage V of driving transistort′h=Vth+ΔVth, and will be real-time
Input data signal wire obtains the real-time compensation of mobility after initial threshold voltage in threshold voltage replacement compensating test signal
Value carries out real-time compensation to the threshold voltage and mobility of driving transistor, to improve the luminous uniformity of pixel circuit.
Wherein, it needs first to measure predeterminated voltage before compensating for mobility and threshold voltage, as shown in figure 3, can
Predeterminated voltage is measured by following steps:
S120: the initial threshold voltage of driving transistor is obtained to data signal line write-in threshold testing signal.
In a preferred embodiment, as shown in figure 4, S120 is specific can include:
S121: threshold testing signal is inputted to the data signal line.Preferably, controllable switch unit conducting data letter
Number line and driving TFT can input resetting voltage V to sensing signal lineref, VrefLess than the threshold testing signal V of data signal lineG
Voltage, so that driving TFT conducting to generate electric current is that first capacitor device C1 charges, the voltage of first node P constantly rises, such as figure
Shown in 5.
S122: cut-off of the first node P in the driving transistor cutoff is sensed by the sensing signal line
Voltage.When first capacitor device C1 charging makes the voltage of first node P reach VG-VthWhen, driving TFT cut-off, driving TFT is no longer produced
Raw electric current, first capacitor device C1 are not recharged, then the voltage of first node P is constant.
S123: the initial threshold voltage of driving transistor is obtained according to the threshold testing signal and the blanking voltage.
The voltage of first node P, can be calculated driving TFT when driving TFT cut-off can be detected by sensing signal line
Threshold voltage, i.e., it is described driving transistor initial threshold voltage VthFor
Vth=VG-VS1
Wherein, VGFor the voltage value of the threshold testing signal, VS1For the voltage value of the blanking voltage.
S130: compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains mobility
Initial compensation value, input offset test signal after drive TFT control terminal and with the voltage change of the one end connecting first node P,
As shown in Figure 6.
Specifically, S130 can include:
Determine the compensating test signal Vdata1For
Vdata1=GL+Vth
Wherein, GL is fixed gray value, VthFor the initial threshold voltage for driving transistor；
The driving current i of driving transistor generation is when the compensating test signal inputs
I=μ (Vdata1-Vth)2=μ (GL+Vth-Vth)2=μ (GL)2
Wherein, μ is the initial migration rate for driving transistor；
Detection is obtained by time interval T2The second voltage of first node P can obtain the mobility of driving transistor, root
The initial compensation value K of mobility can be obtained according to preset standard mobility, so that the mobility of driving transistor reaches same standard,
Keep the light emission luminance of display panel uniform.
Wherein, K is
I=U2/T2
Wherein, μ0For standard mobility, U2For second voltage.
S140: real-time testing signal is formed according to the initial threshold voltage and the initial compensation value and input data is believed
Number line senses the first voltage of the first node P Jing Guo the first preset time as predeterminated voltage by the sensing signal line.
For driving TFT, when the threshold voltage of mobility and driving TFT are by normal compensatory, given fixation is defeated
Enter, driving TFT output electric current is steady state value, is charged with the constant current to first capacitor device C1, and the charging time is first default
Time, the voltage value in sensing signal line is first voltage Tag1.Since the first voltage is mobility and threshold voltage quilt
The value compensated for, so first voltage and the mobility of driving TFT and driving TFT threshold voltage unrelated, for later any
Moment, regardless of the mobility and threshold voltage of driving TFT changes, when the mobility and threshold voltage compensation of external compensation are equal
When correct, first capacitor device the first preset time of charging is given, the voltage value of resulting first node P should permanent be Tag1Value, institute
With can be by Tag1As the current mobility of a detection and driving TFT whether by the correct value of compensation.
In alternative embodiments, when to data signal line input real-time testing signal determining predeterminated voltage,
Display panel can be at off-mode, and pixel circuit is not shown, i.e., data signal line no data signal inputs.It is preferred at other
In embodiment, display panel can also be in open state, and the picture of pixel circuit is completely black picture, i.e. data signal line at this time
The data-signal of input is low level, so that closer when preset voltage value is with practical application.
Specifically, real-time testing signal Vdata2For
Vdata2=α K+Vth
Wherein, K is the initial compensation value for driving transistor mobility, and α is definite value, VthFor the initial threshold for driving transistor
Voltage；
The driving current of the driving transistor is when real-time testing signal input
I '=μ (Vdata2-Vth)2=μ (α K+Vth-Vth)2=μ (α K)2
The first voltage is
VS1=T1I '=T1μ(αK)2
Wherein, T1For the first preset time.
Optionally, α can select 1/2 or 1 equal numerical value according to voltage conditions such as the threshold voltage values of light emitting diode.
For example, when α is 1/2,
I '=μ (Vdata2-Vth)2=μ (K/2+Vth-Vth)2=μ (K/2)2。
In being preferably carried out mode, switch unit may include switch TFT, the control terminal and scanning signal of switch TFT
Line connection, first end connect with data signal line, and second end is connect with the control terminal of TFT is driven, and drives the first end and the of TFT
The connection of one voltage end, second end are connect with first node P.
In being preferably carried out mode, luminescence unit may include AMOLED light-emitting component, the anode of light-emitting component and first
Node P connection, cathode are connect with real-time voltage end, and the voltage at first voltage end is greater than real-time voltage end, and real-time voltage end is preferred
Ground can be ground terminal.
In being preferably carried out mode, storage unit can be the second capacitor C2, the first end and drive of the second capacitor C2
The control terminal connection of dynamic TFT, the second end of the second capacitor C2 are connect with first node P.
In the light emitting phase of pixel circuit, switch TFT (by taking switch TFT is NMOS as an example) is in response to scan signal line
The scanning signal of high level and be connected data signal line and driving TFT；Driving TFT (by drive TFT be NMOS for) in response to
The data-signal of the high level of data signal line is connected and generates driving current, and is inputted driving current by first node P
Luminescence unit, so that luminescence unit shines, when scanning signal becomes low level, switch TFT is disconnected, and the second capacitor C2 can be protected
The on state of driving TFT is held so that luminescence unit continuous illumination.
Based on same principle, as shown in fig. 7, the invention also discloses a kind of pixel circuit data signal compensation apparatus, it should
Device includes the correction unit being separately connected with the data signal line and the sensing signal line.The correction unit can will be real-time
Signal input data signal wire is tested, real-time voltage of the first node P Jing Guo the first preset time is detected, it will be described real-time
Voltage is compared with the predeterminated voltage of storage, if there are deviation, adjustment driving transistors for the real-time voltage and the predeterminated voltage
The initial compensation value of mobility is so that the real-time voltage is consistent with the predeterminated voltage, wherein the predeterminated voltage is to pass through
The initial threshold voltage of driving transistor is obtained to data signal line write-in threshold testing signal；According to the initial threshold voltage
It forms compensating test signal and input data signal wire obtains the initial compensation value of mobility；According to the initial threshold voltage and
The initial compensation value forms real-time testing signal and input data signal wire, passes through first by sensing signal line sensing
The first voltage of the first node P of preset time is obtained as predeterminated voltage.
Preferably, which may also include compensating unit, which can be written threshold testing letter to data signal line
Number obtain the initial threshold voltage of driving transistor；Compensating test signal and input data are formed according to the initial threshold voltage
Signal wire obtains the initial compensation value of mobility；Real-time testing is formed according to the initial threshold voltage and the initial compensation value
Signal and input data signal wire sense first of the first node P Jing Guo the first preset time by the sensing signal line
Voltage is as predeterminated voltage.
Preferably, compensating unit and correction unit can be connect by a switch M and analog-digital converter with sensing signal line,
To detect the voltage of first node P.
Based on same principle, the present embodiment also discloses a kind of display panel, including pixel circuit as described above and picture
Plain circuit data signal compensation apparatus.The display panel is OLED display panel, which can be used for mobile phone, plate electricity
Any products or components having a display function such as brain, television set, display, laptop, Digital Frame, navigator.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (10)
1. a kind of pixel circuit data method for compensating signal, the pixel circuit includes switch unit, driving transistor, storage list
Member, luminescence unit and reset detection unit, wherein the switch unit and scan signal line, data signal line and driving crystal
Pipe is separately connected, in response to scan signal line scanning signal and be connected data signal line and driving transistor；The driving is brilliant
The control terminal of body pipe is connect with the switch unit, and first end is connect with the first voltage end, and second end and first node connect
Connect, in response to data signal line data-signal and generate driving current；The storage unit control with driving transistor respectively
End processed is connected with first node, and the luminescence unit is connect with first node and real-time voltage end respectively；The reset detection list
Member includes reset transistor and first capacitor device, and the control terminal of the reset transistor is connect with control line is resetted, first end and
First node connection, second end are connect with the first end of first capacitor device and sensing signal line, the second termination of first capacitor device
Ground, which is characterized in that
The compensation data signal method includes:
By real-time testing signal input data signal wire, real-time voltage of the first node Jing Guo the first preset time is detected,
By the real-time voltage compared with the predeterminated voltage of storage, if there are deviation, adjustment for the real-time voltage and the predeterminated voltage
Drive the initial compensation value of transistor mobility so that the real-time voltage is consistent with the predeterminated voltage,
Wherein, the predeterminated voltage measures by the following method:
The initial threshold voltage of driving transistor is obtained to data signal line write-in threshold testing signal；
Compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains the initial compensation of mobility
Value；
Real-time testing signal and input data signal wire are formed according to the initial threshold voltage and the initial compensation value, is passed through
The first voltage of first node of the sensing signal line sensing Jing Guo the first preset time is as the predeterminated voltage.
2. pixel circuit data method for compensating signal according to claim 1, which is characterized in that threshold value is written to data signal line
The initial threshold voltage that test signal obtains driving transistor specifically includes:
Threshold testing signal is inputted to the data signal line；
Blanking voltage of the first node in the driving transistor cutoff is sensed by the sensing signal line；
The initial threshold voltage of driving transistor is obtained according to the threshold testing signal and the blanking voltage.
3. pixel circuit data method for compensating signal according to claim 2, which is characterized in that described to drive the initial of transistor
Threshold voltage VthFor
Vth=VG-VS1
Wherein, VGFor the voltage value of the threshold testing signal, VS1For the voltage value of the blanking voltage.
4. pixel circuit data method for compensating signal according to claim 1, which is characterized in that according to the initial threshold voltage
The compensating test signal initial compensation value that simultaneously input data signal wire obtains mobility is formed to specifically include:
Determine the compensating test signal Vdata1For
Vdata1=GL+Vth
Wherein, GL is fixed value, VthFor the initial threshold voltage for driving transistor；
The driving current i of driving transistor generation is when the compensating test signal inputs
I=μ (Vdata1-Vth)2=μ (GL+Vth-Vth)2=μ (GL)2
Wherein, μ is the initial migration rate for driving transistor；
Detection is obtained by time interval T2The second voltage of first node obtains the mobility of driving transistor, according to pre- bidding
Quasi- mobility obtains the initial compensation value K of mobility
I=U2/T2
Wherein, μ0For standard mobility, U2For second voltage.
5. pixel circuit data method for compensating signal according to claim 4, which is characterized in that
The real-time testing signal Vdata2For
Vdata2=α K+Vth
Wherein, K is the initial compensation value for driving transistor, and α is definite value, VthFor the initial threshold voltage for driving transistor；
The driving current of the driving transistor is when real-time testing signal input
I '=μ (Vdata2-Vth)2=μ (α K+Vth-Vth)2=μ (α K)2
The first voltage is
VS1=T1I '=T1μ(αK)2
Then predeterminated voltage Tag1For
Tag1=VS1=T1μ(αK)2
Wherein, T1For the first preset time.
6. pixel circuit data method for compensating signal according to claim 1, which is characterized in that the adjustment data-signal
It is specifically included so that the real-time voltage is consistent with the predeterminated voltage:
When the real-time voltage be greater than the predeterminated voltage, reduce the initial compensation value of mobility；
When the real-time voltage be less than the predeterminated voltage, increase the initial compensation value of mobility；
Above step is repeated until the real-time voltage is equal to the predeterminated voltage.
7. pixel circuit data method for compensating signal according to claim 1, which is characterized in that the adjustment data-signal
It is specifically included so that the real-time voltage is consistent with the predeterminated voltage:
Obtain the VthDrift value Δ VthFor
Δ Tag=Tag2-Tag1
Wherein, α is definite value, and K is the initial compensation value of mobility, Tag2For real-time voltage, Tag1For predeterminated voltage；
According to the drift value Δ VthThe real time threshold voltage of driving transistor is obtained, and real time threshold voltage is replaced into compensation and is surveyed
Input data signal wire obtains the real-time compensation value of mobility to replace initial compensation value after initial threshold voltage in trial signal.
8. pixel circuit data method for compensating signal according to claim 1, which is characterized in that the pixel circuit is display shape
When state, the digital signal of the digital signal line nil signal input or digital signal line input is low level.
9. a kind of pixel circuit data signal compensation apparatus, the pixel circuit includes switch unit, driving transistor, storage list
Member, luminescence unit and reset detection unit, wherein the switch unit and scan signal line, data signal line and driving crystal
Pipe is separately connected, in response to scan signal line scanning signal and be connected data signal line and driving transistor；The driving is brilliant
The control terminal of body pipe is connect with the switch unit, and first end is connect with the first voltage end, and second end and first node connect
Connect, in response to data signal line data-signal and generate driving current；The storage unit control with driving transistor respectively
End processed is connected with first node, and the luminescence unit is connect with first node and real-time voltage end respectively；The reset detection list
Member includes reset transistor and first capacitor device, and the control terminal of the reset transistor is connect with control line is resetted, first end and
First node connection, second end are connect with the first end of first capacitor device and sensing signal line, the second termination of first capacitor device
Ground, which is characterized in that
Described device includes the correction unit being separately connected with the data signal line and the sensing signal line；
The correction unit is used to the real-time testing signal input data signal wire it is default by first to detect the first node
The real-time voltage of time, by the real-time voltage compared with the predeterminated voltage of storage, if the real-time voltage and the default electricity
There are deviations for pressure, and the initial compensation value of adjustment driving transistor mobility is so that the real-time voltage and the predeterminated voltage one
It causes, wherein the predeterminated voltage is to obtain the initial threshold of driving transistor by the way that threshold testing signal is written to data signal line
Threshold voltage；Compensating test signal is formed according to the initial threshold voltage and input data signal wire obtains the initial benefit of mobility
Repay value；Real-time testing signal and input data signal wire are formed according to the initial threshold voltage and the initial compensation value, is led to
The first voltage for crossing first node of the sensing signal line sensing Jing Guo the first preset time is obtained as predeterminated voltage.
10. a kind of display panel, which is characterized in that believe including pixel circuit as claimed in claim 9 and pixel circuit data
Number compensation device.
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Also Published As
| Publication number | Publication date |
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| US10825392B2 (en) | 2020-11-03 |
| CN109119026B (en) | 2020-06-23 |
| US20200105191A1 (en) | 2020-04-02 |
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